The function s(t) describes the motion of a partide along a line. s(t) = t- 14t + 21 (a) Find the velocity function v(t) of the particle at any time t 2 0. v(t) = (b) Identify the time Interval(s) In which the particle Is moving In a positive direction. (Enter your answer using Interval notation.) (c) Identify the time Interval(s) on which the particle is moving in a negative diırection. (Enter your answer using Interval notation.) (d) Identify the time(s) at which the particle changes direction. (Enter your answers as a comma-separated list.) t3D

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